Hand warmer



FIG. 1 is a first perspective view of a hand warmer showing my new design;

FIG. 2 is a second perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top view thereof;

FIG. 8 is a bottom view thereof; and,

FIG. 9 is an exploded view of the hand warmer thereof.

The broken lines shown in the drawings depict portions the hand warmer that form no part of the claimed design. 

CLAIM The ornamental design for a hand warmer, as shown and described. 